Speaker
Description
The Mu2e experiment will search for Beyond-the-Standard-Model, Charged Lepton Flavor Violation (CLFV) in muon capture $\mu^- + \text{Al}\rightarrow e^- +\text{Al}$, with a single event sensitivity surpassing the current world's best limit by 10,000 times. To report a reliable result, the number of stopped muons will be normalized to 10\% precision utilizing a combination of two $\gamma$-ray and one x-ray transitions. The first, directly proportional to the CLFV signal is the 1808.7 keV $\gamma$-ray emitted promptly in the muon capture process,
$\mu^{^{-1}} + _{}^{27}\textrm{Al} \rightarrow V_{\mu } + _{}^{26}\textrm{Mg}^{*} + n$
$ _{}^{26}\textrm{Mg}^{*} \rightarrow _{}^{26}\textrm{Mg} + \gamma $
The second, is the 346.8 keV x-ray emitted promptly from the 2p$\rightarrow$1s muonic atomic transition in Al, from muon stops in the target. The third, is the 844 keV $\gamma$-ray from the $\beta$-decay
$_{}^{27}\textrm{Mg} \rightarrow _{}^{27}\textrm{Al} + \beta ^{-1} + \bar{v_{e}} + \gamma $
where $^{27}$Mg is produced in the muon capture process, and decays with a lifetime of 9.5 minutes.
The stopped-muon rate measurement will use two complementary photon counting detectors. One of them, the LaBr$_3$ detector, is capable of high rate operation up to and above 800 kcps, with 0.7 % energy resolution. The other, the HPGe detector is capable of energy resolution of 0.1%, however, its rate capability is limited to an estimated $\sim$100 kcps.
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